To me, there are two things that are valuable:
- New developments in the language
- Advanced techniques
That's why I follow these two channels:
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Zoran Horvat: In this channel, you will find advice on development and architecture in .NET and C#. He is really keen on functional programming and bends C# to fit into his preferences. Even though you are not so inclined, the way he uses the language really helps understanding some advanced features.
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Nick Chapsas: He explains language concepts in a comprehensible way. This is a good channel to follow new developments in the language.